Compare samsung galaxy alpha vs samsung galaxy a51 with our phone comparison tool and get side-by-side specifications. google pixel 4a (unlocked/128 gb) google pixel 4a (unlocked/128 gb) compare phone and tablet specifications of up to three devices. type a model name in the search field of our phon. Learn samsung galaxy a51. a factory reset, also known as hard reset, is the restoration of a device to its original manufacturer settings. this action deletes all the settings, applications and personal data from your device and make it 100% clean. Now input your google account password and the samsung galaxy a51 should be unlocked. second option samsung galaxy a51 without google account. use the factory reset. however, be aware that you may lose all data on your samsung galaxy a51. I have forgotten the screen lock code for samsung galaxy a51. what should i do? · the system should alert you after having typed it wrong password five times. We were impressed with this smartphones affordabl...